Proclaim
late Middle English proclame, from Latin proclamare ‘cry out’, from pro- ‘forth’ + clamare ‘to shout’. The change in the second syllable was due to association with the verb claim.
wiktionary
From Middle English proclamen, proclaime, from Old French proclamer, from Latin prōclāmō, prōclāmāre, from prō-(“forth”) + clāmō(“to shout, cry out”). Spelling altered by influence of claim, from the same Latin source ( clāmō).
etymonline
proclaim (v.)
"make known by public announcement, promulgate," especially by herald or crier, late 14c., proclamen, from Latin proclamare "cry or call out," from pro "forth" (from PIE root *per- (1) "forward") + clamare "to cry out" (from PIE root *kele- (2) "to shout"). Spelling altered by influence of claim. Related: Proclaimed; proclaiming; proclaimer.
